Origin: Latin suffix -ate
Directorate has 2 different meanings across 1 category:
a group of persons chosen to govern the affairs of a corporation or other large institution
"The new directorate will meet next week to discuss the company's annual budget."
An agency headed by a director, usually a subdivision of a major government department.
"The new environmental directorate was established to oversee all federal climate change initiatives."
In plain English: A directorate is a group of people who work together to make important decisions for an organization.
"The new directorate will oversee all financial decisions for the company next year."
Usage: Use director to refer to the individual leader and reserve directorate specifically for the administrative body or agency they head. This distinction avoids confusion when discussing whether you are naming a person in charge or an organization under their supervision.
The word directorate comes from combining the root director with the suffix -ate. It entered English to denote a group of directors or an executive body responsible for managing an organization.